Intermediates are substances formed during the middle stages of a chemical reaction. They are often unstable and can quickly convert into products or revert to reactants. Understanding intermediates is crucial in fields like organic chemistry and biochemistry, as they help scientists predict the outcome of reactions and design new compounds. In the context of education, intermediates can refer to learners who have moved beyond the beginner level but are not yet advanced. These individuals possess a foundational understanding of a subject, such as language learning or musical instruments, allowing them to build on their skills and knowledge effectively.